Well photo mode is one form of new content, it may not require the same amount of animation and mocap work as new dialogue scenes or cutscenes do but it does require new ways of implementation. It's been a highly requested change, and so was magic mirror/mid-game customization. So it's very safe to say that the highly requested changes are or will be implemented.
From what I gather, that would be dye previews and inventory rework to make that a little easier/better, as well as hugging all companions when we've reached a certain point of friendship/reputation, potentially the gifting option as well. Then it's very much Karlach's story/quest/ending, polyamory reworks, Halsin and Minthara bugs and overall improvements as well as an even higher difficulty (Hardcore mode). And of course the already confirmed epilogue rework. Besides a ton of bugs and a generally messy Act 3 that needs polishing and reworking, I think it's safe to say that we'll see big and small stuff get added. It's just a shame we don't have a flowchart/roadmap from Larian.
